<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>404 - 页面未找到</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            background-color: #f5f5f5;
            color: #333;
            text-align: center;
            padding: 0;
            margin: 0;
            height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }
        .container {
            max-width: 600px;
            padding: 20px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
        }
        h1 {
            font-size: 5rem;
            margin: 0;
            color: #ff6b6b;
            animation: pulse 2s infinite;
        }
        h2 {
            font-size: 1.8rem;
            margin-top: 0;
        }
        p {
            font-size: 1.1rem;
            margin-bottom: 30px;
        }
        .btn {
            display: inline-block;
            padding: 12px 30px;
            background: #4a90e2;
            color: white;
            text-decoration: none;
            border-radius: 50px;
            font-weight: bold;
            transition: all 0.3s ease;
            box-shadow: 0 3px 10px rgba(74, 144, 226, 0.3);
        }
        .btn:hover {
            background: #357abd;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(74, 144, 226, 0.4);
        }
        .gobang-icon {
            width: 80px;
            height: 80px;
            margin-bottom: 20px;
            opacity: 0.8;
        }
        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }
    </style>
</head>
<body>
    <div class="container">
        <!-- 可以替换为你的五子棋LOGO -->
        <svg class="gobang-icon" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
            <path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm0 18c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8z" fill="#4a90e2"/>
            <circle cx="12" cy="12" r="3" fill="#4a90e2"/>
            <circle cx="7" cy="12" r="2" fill="#4a90e2"/>
            <circle cx="17" cy="12" r="2" fill="#4a90e2"/>
        </svg>
        <h1>404</h1>
        <h2>哎呀，页面走丢了！</h2>
        <p>您访问的页面不存在或已被移除，请检查网址是否正确。</p>
        <a href="/" class="btn">返回首页</a>
    </div>
</body>
</html>